package com.cobra.mapreduce.wordcount;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

/**
 * KEYIN map阶段输入的key类型，LongWritable
 * VALUEIN map阶段输入的value类型 Text
 * KEYOUT,map阶段输出的key类型 Text
 * VALUEOUT map阶段输出的value类型 IntWritable
 */
public class WordCountMapper extends Mapper<LongWritable, Text,Text, IntWritable> {
   private Text outK = new Text();
   private IntWritable outV = new IntWritable(1);
    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
      //1.获取一行
        String line = value.toString();
        //2.切割
        String[] words = line.split(" ");
        //3.循环写出
        for(String word:words){
            outK.set(word);
            //写出
            context.write(outK,outV);
        }


    }
}
